Improvement in centring-square



- G. w. BROOKS.

Centering Square.

No. 32,917. Patented Oct. 13, 1868.

N. PHERS, PHDTO-LITNOGRAFHER, WASHINGTON D C dmond fi t- @atwt hit-its.

GEORGE BROOKS, OF CLINTON, MASSACHUSETTS. Letters Patent No. 82,917, dated October 13, 1868 IMPROVEMENT IN CENTRING-SQU'ARE.

V The Scheduler-eluted to in these Letters Patent and making part of the same.

To all whom it may concewt:

Be it known that I, GEORGE W. Bnooxs, of Olinton, county of Worcester, and State of Massachusetts, have invented a new and improved Universal Square; and I do hereby declare that thefollowin'g isa full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in applying to an angle of ninety degrees, made of iron or any other suitable material, of the proper form, a-movable tongue, of an u-form', which shall be attached to the angle by a bolt and thumb-nut, in such a way that it will divide the angle exactly in the centre, thus making a tool, which can be used for making alongitudinal line on shafting or anything of a like form, or for centring shafting or circular disks, and also as an inside or an outside square.

To enable others skilled in the arts to make and use my invention, I will-proceed to describe its construction, and the manner of using the same.

I construct my angle of the form, substantially as shown at a, (see' drawings,) with the brace e on the outside to strengthen it, and the ear 9 with the slot i,

Figures 2 and 4, to receive the tongue I). The two beams a a are made with a wide bearing, thereby preventing the square from'rocking or twisting round, when placed astride of any cylindrical object. The

' tongue 7) is held in place by the bolt 0 and thumb-nut d. The tongue I) is made in theform of an L, the short arm" of which is providedwith a slot, f, extending from near the extreme end to the. angle of the L, and continued a short distance into the other arm, as shown in Figures 1 and 3. I

The tongue b at the angle, as shown at k, is made with a small curve, so that by loosening the thumb nut d, the square maybe easilyand quickly changed from a centring-tool toa longitudinal lining-c001, or

end, one edge of which will divide the shaft exactly in the centre.

For making longitudinal lines on shafting for keyways or any other purpose, the tongue 72 is secured to the square in the manner as shown in figs. 3 and 4, and the square is placed on the object to be lined, the long arm of the tongue resting lengthwise on the shaft, thereby lining'it exactly over and parallel with the centre. Having described my invention, I claim, in combination with the square, the adj nstable slotted bar I), when constructed as and for the purpose substantially as described.

- GEO. W. BROOKS.

. Witnesses:

IRA Gnnn'nouen,

An'rnrrus W. GODDARD. 

